IL4pred2 is a web server designed for users involved in vaccine development. IL-4 regulates antibody production, hematopoiesis, and inflammation, as well as the formation of effector T-cell responses. It is produced only by a subset of activated hematopoietic cells, including T cells, Fc epsilon R1+ mast cells and basophils. This server allows users to predict and design peptides that induce Interleukin-4. Several methods have previously been developed for identifying MHC class II binders capable of activating T-helper cells. These T-helper cells induce a variety of cytokines, including IL-4 and IFN-gamma.We present an updated version of IL4Pred developed by our group in 2013 as IL4Pred2.